Iodine is a yellowish solution. a starch solution is white. a starch solution turns purplish-black in the presence of iodine. if you wait a few hours, then add iodine to the beaker, what color would the beaker solution be?
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Ответ:
The correct answer will be- the color change will be observed and the solution will turn purplish-black.
Explanation:
Iodine test is performed to test the presence of the carbohydrates mainly starch.
The iodine solution is chemically called potassium iodide which forms a yellow solution. The potassium iodide solution forms a complex with a starch solution which appears a purplish-black color which shows the presence of the carbohydrates.
In the given question, if we add the iodine solution to the beaker after a certain point of time then it will still form a complex with the starch and thus beaker solution will appear darker in color.
Ответ:
6.58-8.36x=3.98x-27.33
Collecting like terms
6.58+27.33=3.98x+8.36x
33.91=12.34x
33.91/12.34=12.34/12.34
x=2.75